Question: Which nuclear isomer of bismuth has the least neutrons ?
Paraphrase: Which atomic isomer of bismuth has the slightest neutrons ?
SPARQL (Wikidata): select ?ent where { ?ent wdt:P31 wd:Q846110 . ?ent wdt:P1148 ?obj . ?ent wdt:P279 wd:Q942} ORDER BY ASC(?obj)LIMIT 5 
Answer: bismuth-184m, bismuth-185m, bismuth-186m, bismuth-187m1, bismuth-187m2